package com.common;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.base.BaseControllers;
import com.util.WebConstants;

public class CommonInterceptor extends BaseControllers implements HandlerInterceptor  {

	private Logger log = Logger.getLogger(CommonInterceptor.class);
	
	public CommonInterceptor() {
		// TODO Auto-generated constructor stub
	}

	private String mappingURL;//利用正则映射到需要拦截的路径  
        public void setMappingURL(String mappingURL) {  
               this.mappingURL = mappingURL;  
       } 

	/**
	 * 在业务处理器处理请求之前被调用
	 * 如果返回false
	 *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
	 * 
	 * 如果返回true
	 *    执行下一个拦截器,直到所有的拦截器都执行完毕
	 *    再执行被拦截的Controller
	 *    然后进入拦截器链,
	 *    从最后一个拦截器往回执行所有的postHandle()
	 *    接着再从最后一个拦截器往回执行所有的afterCompletion()
	 */
	@Override
	public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler) throws Exception {
		// TODO Auto-generated method stub
		//log.info("==============执行顺序: 1、preHandle================");
		Object userSession=request.getSession().getAttribute(WebConstants.CURRENT_USER);
		String url=request.getRequestURL().toString();
		if(null==userSession){
			if(url.indexOf(".json")>0)
				writerJson(response, errorMsg("登录超时，请重新登录！"));
			else
				response.sendRedirect("/login");
			return false;
		}
		return true;
	}

	//在业务处理器处理请求执行完成后,生成视图之前执行的动作 
	@Override
	public void postHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub
		//log.info("==============执行顺序: 2、postHandle================");
	}

	/**
	 * 在DispatcherServlet完全处理完请求后被调用 
	 * 
	 *   当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
	 */
	@Override
	public void afterCompletion(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		//log.info("==============执行顺序: 3、afterCompletion================");
	}

}

